Valve-gear.



S. ROSENZWEIG.

VALVE GEAR.

APPLICATION FILED IUNE $1918- 13298,?98, Patented Apr. 1,1919.

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El mvewtoz aftozneg S. ROSENZWEIG.

VALVE GEAR.

APPLICATKON HLED JUNE 3. 1918.

1,298,,796. Patented Apr, 1,1919.

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ATES ATENT union VALVE-GEAR.

Specification of Letters Patent.

Patented Apr. 1, 1919.

Application filed June 3, 1918. Serial No. 237,848.

To all whom it may concern:

Be it known that I, SIEGFRIED ROSENZWEIG, a citizen ofthe United States, and a resident of New York city, in the county and State of New York, have invented certain new and useful lmprovements in Valve-Gear, of which the following is a specification.

My invention relates to the valve gear of an engine of the reciprocating type in which puppet valves are employed, and'it consists in certain improvements which will first be described in connection with the accompanying drawings and will then be more particularly pointed out in the claims.

Figure 1 is a longitudinal vertical axial sectional elevation of so much ofa steam cylinder provided with my improvements in their preferred form as needed for the purpose of explanation,

Fig. 2 is a cross section on line 2-2 of Fig. 1,

Fig. 3 is a longitudinal sectional elevation on line 3-3, Fig- 1.

Like reference characters indicate correspondingparts in all the figures.

A is the steam cylinder, in this instance occupying a horizontal position. At each end of the cylinder is a pair of valvesa steam valve V and an exhaust valve V- which are contained in a valve chamber B. The two valve chambers B at opposite ends of the steam cylinder, and the intermediate internally machined tubular bearing D, which extends longitudinally of the steam cylinder, opening at its opposite ends into the valve chambers and intended to receive and support the valve operating cam or tappet shaft. are preferably cast in one with the cylinder and are so shown in the figures referred to. The valve operating cam or tappet shaft may be of any suitable type, whether axially oscillatory or longitudinally reciprocatory, as preferred. In the drawings the cam or tappet shaft E is of the longitudinally reciprocatory type, and fits and is capable of longitudinal movement without rotation in the said bearing D, extending through the latter into and through the terminal valve chambers B a shown. The

shaft E is formed on diametrically opposite stems of the steam and exhaust valves respectively at each end of the cylinder.

On the exterior opposite sides of the two valve chambers are axial prolongations D of the bearing D, which receive and support the end portions of the cam shaft. The

. valves, valve fittings and valve gear are the same for each chamber B, so that a description of one will answer for both.

The valve chamber which is cylindrical in contour extends crosswise of and tangential to the steam cylinder and, through a port a about midway between the ends, communicates with the interior of the said cylinder. The valve chamber is machined out internally to provide a seat for a double cage C of cylindrical exterior which is removably but closely fitted therein and pressed back to bring up against a shoulder b at or near the end of the double chamber opposite that end of it from which the double valve cage is inserted. The double valve cage, which preferably is made as shown with symmetricalunbroken exterior and a clearance chamber for each of its valves confined wholly within the walls of the cage, as more fully described in my Patent No. 1,125,724 of J anuary 19, 1915, is, as represented in Figs. 13, a single integral casting subdivided internally by two partition walls 0 0 into two end compartments 0, 0 the one to receive the steam valve V and the other to receive the exhaust valve V, and an intermediate portion 0 formed with a tubular bearing D which extends diametrically crosswise of the double cage and intervenes between, and is on the axial prolongation of, the tubular bearing members D, D opening into, and forming a continuation of, the latter, as shown more particularly in Fig. 3, for the purpose of supporting that portion of the valve operating cam or tappet shaft E, which passes transversely through the cage and valve chamber, and directly acts upon the valves. Within each valve containing compartment 0 of the double cage is an axial tubular guide as for. the valve spindle w which carries the double seated puppet steam valve V or exhaust valve V, as the case may be, of usual construction, with faces o, 'v to cooperate with the seats o', 'v' in the cage C. The two valves V, V are diametrically opposed to one another as shown. The interior opposite ends of their spindles or stems 10, extend through diametrically opposite guide openings (5 in the bearing D, and engage the cam shaft from opposite sides as shown in Fig. 3,.being held in yielding engagement therewith by spring pressure, as indicated, the spring pressure, as usual in this class of devices, being exerted in a direction to close the valve. The central or intermediate portion a of the valve cage straddles the port a, the clearance spaces'of the two valve compartments 0, c on either side of the intermediate compartment 0 communicate freely at all times with the pforta. Any suit'ablelspring closing devices for the valves may be employed. In the present instancet'lie outer end of the valve spindle, is rigidly connected't'o' a guide sleeve 7", which snugly" encircles and is slidable on the s'pindlefguid'e w', and'is provided with a cross pin or bar g, the laterally protruding endsof which enter and are movable in longitudinal guide slots h in the tubular case i in which the spring 70 ishoused, said spring being confined betweenthe head of the case and the head of the spindle and tending to force the latter to move in a direction to close the'valve. The case 2' is attached to a suitable cover B which tightly closes each end of the valve chamber B. The cross ping passes not only through the guide sleeve, but

alsofthrough'the h ead'of the valve stem or spindle 'i'nclosed'by thelatte'r; and it serves ii'i'i'conjunctioawith' the guide slots' h in which it moves, to assure and maintain the Valve stem in proper position relatively to the cam recesses in the valve operating shaft. Each steam valve compartment 0 is provided with an inlet S communicating with a source of steam supply. The exhaust valve compartment c, is in communication with an exhaust X, which, as shown, is common to the exhaust valves'at both ends of the cylinder. In order to provide a two-seated puppet exhaust'valve in which the dimensions of-the inner seat are so related to those of the outer seat that the steam pressure, while the valve is closed, will tend to hold the valve in its seat, or at least to so far balance the pressure as to prevent the valve from lifting during the closed period, I make use of a balancing ring '0 of known type (such as for example as illustrated in expired Patents Nos. 652,02930 of June 19, 1900) on which the outer seat 12 for the exhaust valve V is formed-'said balancing ring being interposed'between the shoulder 12 of the valve chamber andthe adjoining end of the cage C, and'being held in place by the same means (the annular clamping ring 13 which holds in. place the cage. The clamping ring B is located in that 'end of the valve chamber from which'the cage 0 isin'se'rted and is attached to the inner face of the cover B at that end of the valve chamber by legs B as shown in Fig. 1. Suitable packing is of course provided at such points as may be required, to guard against steam leakage etc. The valve operating-shaft E may have any suitable movement for the purpose. In the arrangement illustrated in Figs. 1-3 it is supposed to have a longitudinal reciprocatory movement without rotation, which can be produced by any suitable means usually em ployed for the purpose, as for example by an eccentric on a cross shaft driven through proper intermediaries from the engine shaft. Obviously instead of employing a' solid cam shaft, said shaft may be longitudinally split into two sections each of which will carry the cam or tappet' surfaces for operating the appropriate valves, and will be operated by its own eccentric or other actuating mechanisin. i i

The described arrangement is compact and effective, the valve operating appliances, as well as the valves themselves and their fittings, are completely housed and shielded from dust, dirt and other injurious influences; the double valve cage in which these parts are thus housedis adapted to be fitted into and removed from the valve chamber as a unitary structure; and said cage when thus fitted into the valve chamber is clamped in place and released'synchronous'ly' with the application to and removal from the end of the valve chamber from which the cage i's'inserted of the cover by which the said end'is closed. Furthermore in this unitary double cage construction the valves, spindles and operating cam shaft can be completely assembled and tried out for accurate and smooth operation qbefore these parts are put into the valve chamber. And finally the boring of the hole in the intermediate bearing portion 0, for the therein can be varied to some extent without departure from the principle of the invention; I therefore do not limit my claims strictly to those details, but what I claim as new and of my own'invention is as follows:

1. The combination of a steam cylinder; a valve chamber extending crosswise of the cylinder; and a double valve cage formed with end compartments adapted to-receive steam admission and exhaust valves respectivelyand provided with seatstofcooperate with said valves, and an'intermedia'te portion between the two valve containing end compartments adapted to receive and support the valve-operating means common to both va1ves-said cage being adapted to be fitted into and removed from the valve chamber as a unitary structure.

2. In combination with the elements of- Copies of this patent may be obtained for five cents each, by addressing the claim 1 a single steam cylinder port communicating wlth, and common to, the two end. compartments, and straddled by the intermediate bearing portion, of the double valve cage.

In testlmony whereof I aflix my signature.

SIEGFRIED ROSENZWEIG.

commissioner of Patents,

Washington, .D. 0. 

